procedure for the copper-mediated oxidativetrifluoromethylthiolation of potassium aryl- and heteroaryltrifluoroborates with Ruppert–Prakash reagent and elementalsulfur is presented. Aryl trifluoromethyl thioethers can be prepared in good to moderate yield under mild reaction conditions. A facile procedure for the copper-mediated oxidativetrifluoromethylthiolation of potassium aryl- and heteroaryltrifluoroborates